In this section we construct the effective lagrangian of the interactions between
X(3872) and other particles. The lagrangian of \(D\bar{D}^{*}\)  interactions has been
constructed by  [1]}, [2]}, [3]}.
However, operators such as \(BKX\) , \(BKD\bar{D}^{*}\) , are not considered previously and
only constant form factors were used in these previous calculation missing information from \(B\)  decay vertex.
